1940: The team of GUF Imperia, Italy

The team of GUF Imperia in A Division of the Italian Championship in early 1940s. Among the players Felipe Cascione (3rd standing from L) one of the important personalities of Imperia, and hero of World War II.
Source: Biancoceleste Bogliasco 1951-2016 by Gianni Lastrico

1945: The team of S.S. Lazio Nuoto

The team of S.S. Lazio Nuoto, winner of the 1945 Italian Championship. It has been the first post-World War II Championship not recognized officially by the Italian Federation for technical reasons. Standing L-R: Ivo Bitetti, Gozzo, Catalani, Tamagnini, Aldo Ghira, Franco Baccini Squatting L-R: Camillo De Giovanni, Caselli, Gemignio Ognio.

Source: http://www.sslazionuoto.it/

1949: The team of Rari Nantes Bologna

The team of Rari Nantes Bologna in 1949. Standing L-R: Albahari, Rolfini, Casanova, Vigna Squatting L-R: Balboni, Codeca, Anfossi

Source: Mondo del Nuoto 1986 

1947: The team of Rari Nantes Bologna

The team of Rari Nantes Bologna in 1947. From L-R: Monari, Codeca, Anfossi, Casanova, Rolfini, Albahari

Source: Mondo del Nuoto 1986 

1948 London: Egypt Vs Great Britain at Finchley pool

Egypt, in white caps, attack Great Britain's goal during their first-round Olympic Games water-polo match, at Finchley open-air pool, London, July 30, 1948. Great Britain drew 1 all with the powerful Egyptian team.

Source: www.dailypress.com/(AP Photo)

1948: The team of Fullerton College, California

The team of Fullerton College all-Southern California team in 1948: From L-R: Bob Brown, Ed Illsey, Bud Householder, Captain Don Bradford, Marvin D. Burns, Hank Imm, and Frank Poucher.

Source: http://libraryfchistory.fullcoll.edu/

1948: The National team of Italy

The Italian National Water Polo team in 1948: Pasquale Buonocore, Emilio Bulgarelli, Mario Majoni, Cesare Rubini, Geminio Ognio, Gianfranco Pandolfini, Aldo Ghira, Gildo Arena, Tullo Pandolfini (Luigi Fabiano, Alfredo Toribolo).

Source: http://www.sslazio.org/

1943: The team of Club Sport Marítimo, Madeira

The team of Club Sport Marítimo, Funchal, Madeira Islands Portugal in 1943.

Source: http://www.arquipelagos.pt/

1955: The legendary Cesare Rubini in action

The technical skills of Cesare Rubini, gold winner with Italy in London 1948 Olympics analysed by the Soviets in 1955.
Source : http://waterpolo99.ru/

1949: The team of Paleo Faliro, Greece

The team of Paleo Faliro (AOPF), Greece during the 1949 National Greek Championship held in the island of Mytilene. From L-R: Lazaridis, Kalliabetsos, Melanofridis, Brousalis, Georgiou, Petropoulow, Sousmazian.

Source: Archives of Paleo Faliro AOPF

1946: The Juniors of HAVK "Mladost" Zagreb

The Juniors team of HAVK "Mladost", Zagreb in 1946.

Source: http://www.havk-mladost.hr/

1948, London: The National team of Australia

The National team of Australia in London 1948 Olympic Games composed by: Colin French, Roger Cornforth, Arthur Burge, Les MacKay, Ben Dalley, Eric Johnson, Leon Ferguson, Jack Ferguson.

Source: http://www.gahetna.nl/

1946: The Champions of R.N Camogli

The team of Rari Nantes Camogli winner of the Italian Championship in 1946. The team: Scelti, Ghisoli, Caorsi, Cristiani, Baldini, Rapetti, Schiaffino, Bozzo. Coach: Carlo De Gregori

Source: “Jantzen” Camogli 1914-1964

1940’s: Academia de Educación Física, Iquique Chile.

The team of Academia de Educación Física, Iquique sub Champion of Chile in the 1940's. The team: Juan Tello, Juan Oxilia, Agustín Solari, A. Solari, Luis González, Carlos González y Juan Magñasco.

Source: http://memorianortina.cl/quienes-somos/

1947: The National Water Polo team of Bermuda island

The Bermuda Islands Water Polo team that represented the Colony in the United States National Water Polo Championship in New York on April 1947. Seated L-R: Ralph Ferguson. Cyril Bardgett, Teddy Franklin, Stanley Gascoigne (Manager and President of the Berbuda Athletic Association), Robert Moulder, Percy Belvin, Leon "Doc" Belvin, Godwin "Rusty" Belvin, W.F."Chummy" Hayward (Coach). 
Source: Credit Line (ACME) 4/8/47

1949: The Dutch team winner of Trofeo Italia

Caricature of the Dutch National Water Polo team winner of the prestigious "Trofeo Italia" held in 1949 in Genova, Italy.
Source: archives of the Royal Dutch Swimming Federation

1941: The team of Ferencvárosi Torna Klub.

The team of Ferencvárosi Torna Klub (FTC) of Budapest in 1941: Török, Molnár, Tátos, Németh, Hohl, Karinthy, Bródy. 
Source: www.huszadikszazad.hu/

1948, London: The Olympic winners

The winners at London 1948 Olympic Games: Italy, Hungary and Holland. 
Source: Picture extracted from IOC's archive and rare footage: http://www.youtube.com/watch?v=-2nljTDwMF8

1940's: The team of Antofagasta of Chile.

The team of Antofagasta, Chile in the 1940's. Standing L-R: Esteban Skornic, Jorge Northland, Milenko Skornic; Squatting L-R: Carlos Ossandon, Raúl Martinez, Orlando Dueñas, Alfonso Martínez.

Source: http://www.flickr.com/photos/ljubs/5971247157/in/photostream/

1945: The Champions of "Gimnasia y Esgrima"

The team of “Gimnasia y Esgrima”, Buenos Aires Champion of Argentina in 1945. From L-R: L.Diez, E.Fraga, J.Farulla, N.Caputo, L.Szabo, R.Ramicone, R.Leyendo, E.Carmaccio, J.Avalos Noguera, M.Pegasano.
Source: magazine “El Grafico” March 1945